CVE-2022-39200
In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly.
Does this matter?
Lower severity and a low EPSS score (0.35%). Track it; it rarely justifies an emergency change on its own.
Description
Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 0.35% probability · 29th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- matrix/dendrite
- Source
- security-advisories@github.com
References
- https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3Patch, Third Party Advisory
- https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267cThird Party Advisory
- https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3Patch, Third Party Advisory
- https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267cThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.